# Часть 1
# Задача А
def true_false(a,b,c):
    if a+b+c <= 1:
        print("false")
    else:
        print("true")
if __name__ == "__main__":
    a = int(input())
    b = int(input())
    c = int(input())
    true_false(a,b,c)

#Задача Б
def rast(x,y):
    rast = ((x-0)**2+(y-0)**2)**0.5
    return rast

if __name__ == "__main__":
    x = int(input())
    y = int(input())
    print(rast(x,y))